bgp in the lab #3

after last blog on sharing full bgp feed for IPv4, I got a number of interesting questions. given many of you were asking to have also IPv6 available, I decided to extend the project to cover that as well.disclaimeryou’re doing this ON YOUR OWN. i’m not responsible for anything on your end and service itself. so if it crashes your router, makes all traffic to follow different paths, or essentially anything that you can’t control - you’re completely on your own.i may also discontinue “the service” at any time, so don’t expect this to last forever :)how to get the full feed for IPv4?things you need to configure on your end to receive full european IPv4 BGP feed to your router:your ASN - 65001my ASN - 57355eBGP multihop sessionno passwordversion 4my IP - 85.232.240.179 (bonus points for spotting geeky octet)your IP - whatever public IPv4 you havetimers - 3600 for hello and 7200 for hold time (very conservative, yes)if you already have your own ASN configured (and for some reason can’t change it despite it’s targeted for lab environments), you can use local-as feature to use 65001 towards me, while keeping your own ASNhow to get the full feed for IPv6?things you need to configure on your end to receive full european IPv6 BGP feed to your router:your ASN - 65001my ASN - 57355eBGP multihop sessionno passwordversion 4my IP - 2001:1A68:2C:2::179 (again, bonus points… ;) )your IP - whatever public IPv6 you havetimers - 3600 for hello and 7200 for hold time (very conservative, yes)be a good citizenplease don’t send any prefixes my way. I’ll filter them out anyway, but why you want to put additional burden on my end? please don’t :)example configuration for IOS/IOS-XEexample config for Cisco IOS/IOS-XE on your side:!

router bgp 65001 ! global proces for ASN 65001, if you already have other ASN ! and can't change it, look below for solution

neighbor 85.232.240.179 remote-as 57355 ! if you want IPv4 feed neighbor 85.232.240.179 ebgp-multihop 255 neighbor 85.232.240.179 version 4 neighbor 85.232.240.179 description to-luke-bgp-full-feed-router neighbor 85.232.240.179 timers 3600 7200 neighbor 85.232.240.179 local-as 65001 ! if you can't use ASN 65001, at least ! identify towards me as 65001 neighbor 2001:1A68:2C:2::179 remote-as 57355 ! if you want IPv6 feed neighbor 2001:1A68:2C:2::179 ebgp-multihop 255 neighbor 2001:1A68:2C:2::179 version 4 neighbor 2001:1A68:2C:2::179 description to-luke-bgp-full-feed-router neighbor 2001:1A68:2C:2::179 timers 3600 7200 neighbor 2001:1A68:2C:2::179 local-as 65001 ! if you can't use ASN 65001, at least ! identify towards me as 65001 !

address-family ipv4 unicast neighbor 85.232.240.179 activate neighbor 85.232.240.179 prefix-list DENY-ALL-V4 out ! address-family ipv6 unicast neighbor 2001:1A68:2C:2::179 activate neighbor 2001:1A68:2C:2::179 prefix-list DENY-ALL-V6 out ! ! ip prefix-list DENY-ALL-V4 seq 5 deny 0.0.0.0/0 le 32 ! ipv6 prefix-list DENY-ALL-V6 seq 5 deny ::/0 le 128 ! also, on your end, you can optimize a bit TCP stack config with things like:ip tcp selective-ack ip tcp window-size 512000 ip tcp path-mtu-discovery example configuration for IOS XRexample config for Cisco IOS XR on your side:! route-policy DROP drop end-policy ! route-policy PASS pass end-policy ! router bgp 65001 address-family ipv4 unicast ! address-family ipv6 unicast ! neighbor 85.232.240.179 remote-as 57355 ebgp-multihop 255 timers 3600 7200 description to-luke-bgp-full-feed-router local-as 65001 ! if you're already using some other BGP ASN, use this ! command to identify as 65001 towards my route server address-family ipv4 unicast route-policy PASS in route-policy DROP out !

! neighbor 2001:1a68:2c:2::179 remote-as 57355 ebgp-multihop 255 timers 3600 7200 description to-luke-bgp-full-feed-router local-as 65001 ! if you're already using some other BGP ASN, use this ! command to identify as 65001 towards my route server address-family ipv6 unicast route-policy PASS in route-policy DROP out ! ! ! summaryhow it is different from session I described in previous post? it has public ASN and can feed you with IPv6 data. other than that - there’s no change.happy BGPing!